Rotary compressor.



W. SHORE.

ROTARY COMPRESSOR.

APPLlCATION man 00124, 1912. RENEWED MAY 10,1915.

PatentedSept l l, 1915.

5 SH EETS-SI!EET 3.

Y W. SHORE.

ROTARY COMPRESSOR.

APPLICATION FlLED 001.24. 1912. RENEWED MAY 10,1915.

1,15 ,741 Patented Sept. 14, 1915.

' 5 SHEETS-SHEET 4.

i v m 1/2 W. SHORE. I ROTARY COMPRESSOR.

APPLICATION FILED OCT. 24, $912- RENEWED MAY 10,1915

PatentedSept. 14, 1915.

5 SHEETS-SHEET 5.

mvzmom MMJ/ w W W d WILLIAM SHORE, 0F TORONTO,

ONTARIO, CANADA, ASSIGNOR, BY DIRECT ,AND MESNE ASSIGNMENTS, THE FBANiEZ-SHORE COMPANY, OF WILMINGTON, DELAWARE, A

conronarron or DELAWARE.

ROTARY COMPRESSOR.

Specification of Letters Patent. Patgntq gd Sgpt 14}, 1 915:

Application filed October 24, 1912, Serial No. 727,558. Renewed May 10, 1915. Serial No. 27,240. i

To all whom it may concern:

Be it known that 1', WILLIAM SHORE, a subject of the King of Great Britain, and resident of the city of Toronto, county of York, Province of Ontario, in the Dominion of Canada, have invented certain new and useful Improvements in Rotary Compressors, as described in the following specification and illustrated in the accompanying drawings, that formpart ofthe same.

The essential features of this invention consist in the novel construction and arrangement of parts, whereby the rotating elements are effectively balanced and the contact shoes are held in fixed relation to the axis of the cylinder and whereby a thorough circulation of a sealing fluid is maintained.

The principal objects of the present invention are to devise a machine wherein the difiiculties due to the friction and vibration of unbalanced parts are eliminated, to re duce wear to the minimum and to obviate leakage at the points of contact of the piston vanes. r a

A further object is to provide a circulation of lubricating fluid under pressure through the machine'which eifects'the perfeet lubrication of the parts and forms a hydraulic packing and also forms a hydraulic balance for the rotating parts.

In the drawings Figure 1 is a longitudinal vertical mid-section of a machine constructed in accordance with this invention. Fig. 2 is a vertical .cross sectional view through the line a-7) Fig- 1. Fig. 8 is a perspective view of the hydraulic packing and balancing sleeves shown partly broken away, one of the piston vanes being shown in position therein and broken away intermediate of its length. Fig. 4: is a perspective sectional view of a set ofintercalated gyratory rings for supporting the piston vanes and vane contact shoes, a portion of one of said vanes being shown in position therein Fig. 5 is a perspective detail of a portion of one of the rings shown in Fig. 4 illustrating the method of balancing the ring. Fig. 6 is a diagrammatic view illustrating the relative positions of the piston vane contact shoes and the vane axes in various positions in the cycle of rotation.

Fig. .7 is a perspective view of one ofthe sliding pistonvanes. Fig. 8 is a transverse sectional view of a portion of the machine showing a slight modification particularly adapted in compressors for high pressure work.

Like numerals of reference indicate corresponding'parts in each figure.

Referring to the drawings,'1 is the outer casing of the machine which is substantially cylindrical in form and provided with a hollow base 2 containing an oil chamber 8.

4 is a cylindrical chamberformed within the portion 5 arranged centrally of the length of the casing 1, said chamber being eeeentricallv arranged in and extending longitudinally through said portion 5. 6'is the inlet port extending throughone side of the central portion 5 and communicating with the cylinder chamber 4.

7 is the outlet port leading from the opposite side of the cylinder chamber 4 and opening through the side wall of the casing 1 and having communication with the oil chamber 3, said inlet and outlet .ports being arranged centrally of the length of the said cylinder chamber a.

8 are annular recesses formed in the central portion 5 and extending inwardly from the ends thereof and arranged concentric to the outer wall of the casing and eccentrically to the chamber 1.

9 are hydraulic packing sleeves adapted to fit into the annular recesses 8 having the circular heads 10 formed integral therewith and of slightly larger diameter than the sleeve portions, the heads 10 abutting the end faces of the central portion 5, and forming gyratory flanges.

11 are packing rings arranged in the annular grooves 12 in the inner ends of the sleeves 9 and 13 are spiral oil grooves formed in the outerperiphery of the sleeves.

14 are a plurality of radially arranged recesses formed in the inner faces of the heads 10 and leading outwardly to and communicating with the longitudinally arranged hydraulic chambers 15 formed in the inner peripheral faces of the sleeves 9. I

16 are disks secured within the sleeves 9 and abutting the inner faces of the heads 10, said disks having a plurality of holes 17 extending.therethrough and leading to the radial recesses 14.

18 are rectangular slot openings extending through the heads 10 of the hydraulic sleeves arranged diametrically opposite and in cenin the outer faces of the disks 16 adjacentto the heads of greaterwidth than the slots 19 and arranged parallel therewith.

I 2]. are packing shuttles fitting within the recesses 20 and adapted to slide therein and closing the slots 18.

22 are heads closing the ends of the easing 1 and having the concentrically arranged journal bearings 23 in which the shaft 24 of the machine is journa'led.

25 is the rotatable piston core rigidly secured upon the shaft 24 and supported within the cylinder chamber 4 in eccentric relation thereto. The cylinder chamber '4 is formed with an arc-shaped recess 26 -atthe bottom side, said recess having a radius cor-.' responding to the radius of the periphery.

of the'piston core 25 and the said core fits snugly into the said recess in a close running fit. The shaft 24 extends longitudinally through the machine passing through the centrally arranged circularopenings in the hydraulic packing sleeve heads and the disks I 16 and fitting tightly therein.

2'7 are radial slots formed in the -piston core 25 extending longitudinally from end to end thereof. 3 p

28 are the piston vanes having'the central portions 29 formed with parallel sides and adapted to fit with a sliding contact in the.

radial slots 27 in the piston core. The piston vanes extend longitudinally through the radial slots 19 and 18 'in'the disks l6 and packing sleeve heads 10, the portions 30 thereof being squared and fitted'snuglyin suitable openings through the packing shut-:- tles 21', the ends of thecentral portionsabut ting said shuttles.

31 are traverse bearing gitudinally from end toend to receive the spindles 33 and said spindles pro ect.

through the outer edge of the central portions 29 asshown particularly in Figs. 2 and 4.

34 are the piston packing shoes rigidlysecured to the pro]ecting central portions of the spindles 33, said shoes being formed of the same radiusas the cylinder'4 and adapted to fit snugly against the inner wall of said cylinder. The ends ofthe shoes 34 are'formedwith laterally extending tongues 35 to provide a longer hearing at the-ends and to carry the shoes well beyond the edges of the slots in the disks 16 so that they will not foul the edges of the said slots. '36 are ribs formed on the outer faces of portions-, -formed on the piston vanes and 32 are the journal 1 ends. The piston vanes'28 are bored lon the heads of the packing sleeves 9 arranged parallel to the radial slots 18.

37 are sets of roller bearings journaled in the cages 38 and arranged between the ribs 36 and the traverse bearing portions 31 of the piston vanes. Each alternate roller in the sets is formed with spur gear teeth 39 adapted to engage corresponding teeth 40 and 41 formed in the vanes 28 and ribs 36 respectively. This construction insures the proper travel of the roller bearings as the vanes move radially in and out.

42 and 43 are intercalated gyratory rings arranged at each endof the machine, the outer rings 42 being rotatably supported in the eccentric recesses 44- formed in casing heads 22 in concentric relation to the cylinder 4. In the form of machine illustrated two radial piston vanes are shown but it will be readily understood that any desired number may be used within the scope of the size of the machine.

In Fig. .4 I have shown a set of four gyratory piston supporting rings in orderto illustrateclearly the manner of intercalating them, the-description of this set applies to the pairs of rings shown in the.

other views. The outer rings'42 are formed L-shaped in cross section, and are each provided with an lnwardly exten'dlng lug memsockt-portion 46 having a centrally arranged circular hole 47 in the end wall, said circular hole being adapted to receive the end ofthe shoe spindle. 33. The rings are nested one within the other and are free to rotate independent of each other thus forming differential supportsfor the piston contact shoes. Each. ring is provided with a lug member 45 extending inwardly and these are arranged an equal radial distance from the center.- The flanges of the outer rings are cut away allowing the outer end walls of all the lugs to be. in a common plane abutting the casing heads.22. When more than two rings are used in a set, I preferably form'" theinner ring with a central band portion 48 supported at intervals by radial ber 45 formed with a cylindrical shaped:

ribs 49 and the lugs 45 are shaped to fit the outer. periphery of said central-band.

.50 are bushings fitted on to the journal .ends 32 of thejnst on-vanes and journaled in the sockets 46. in the, lug portions of "the intercalated rings. The vane pistons are thus supported at the ends at a positive distance from the center of the cylinder 4 and as the spindles are rigidly secured in said rings the packing shoes 34 carried by said spindles are held in a positive position in continuous and uniform running contact with the wall of the said cylinder. The

shoes are thus held from frictional contact with the cylinder due to centrifugal action.

The piston supporting rings are preferably bored with numerous holes on the lug Side depth so that .the 'oil'fpacking'will effect a perfect sealbetween the. inletand discharge. I

51 is-an oil tubesecured in the central v portion 5' of the machine and having a central port-ion52 extending into the oil chamber 3 and the discharge ends 53 arranged to coincide with the holes 17 in the end disksltfiassaid disks rotate.

5 is a longitudinal recess formed in the bottom of theinner wallofthe'cylinderfl communicating withthe exhaust and adapted to receive any particles of solid matter which may get into the cylinder.

55 is a blow outpassage inthe top of the casing communicatingwith theannular recesses 8. Q In the operation of this machine, the shaft '24-is rotated byany suitable power and as.

the piston core 25 issecured thereto itrotates within the eccentric cylinder chamber a The pistoncore 25 n rotation carrles the piston vanes wi'thit and as the said vanes are supported 'byifthe gyratoryj"rings arranged concentric-with the cylinder the said vanes slide in the radialslots inthe core. The

piston shoe spindles are rigidly secured in i v the" recess 551 at the outlet port is also an important feature as any solids entering'the the supportinggyratory rings consequently the shoe and spindle must-always be radial to and a 'constant radius from the operative and controlling center. The piston core is eccentric to the cylinder and as the slots in which the piston vanes- Ioperate are radial to the core, thesaid vanes are'alWays radial .-to the core centerbut atvariables-radii and as the vanes'fciare pendantl-y supported, and swing upon' th'e shoes the rajdialsjof the shoes and varies diverge from theflcenter of,

oscillation forming a rectilinea'lfangle. The diagram shown in Fig 6 illustrates this peculiar feature very-clearly andas the said shoes are'carried by the gyratory rings they face to the cylinder, 1 consequently friction and wear are eliminated; The-surfaces ofthe shoes and thefc ylinder are a close run ning fit andithe lubricating oil-forms a perpresent invention is intheuse of a plurality of"gyratoryring members to support bottom ofthe cylinder chamber and conse-' quently therunningfit between the cylinder wall and pistonitcore will not be impaired. This feature permits of the "core being recessed in to the'cylinder bed a' considerable The rotation of'the' core and piston vanes effects the compressionbf'the air or gas Within the eccentric space between the core and, cylinder Wall, the compressed charge being discharged through the outlet port 7.

The pressu re'of dischar e enters the oil the holes 17 in the disks 16 pass. the discharge ends of the said tube the oil is forced through the radial recessl l in the packing sleeves 9. The combined pressure and centrifugal action fills'the longitudinal recesses in the inner Wall of the packing sleeves and forms a floating support for same thereby minimizingfriction This arrangement of ports and passages forms an'important factor in the balancing-of the engine. The

fluid-lubricant is retainedin the passages by and balances the forces acting against the piston core thereby eliminating unequal pressure on the shaft bearings and -reducing the wear to the minimum.

, The arrangement of thefluid passages ,wi-thin the inner wall of the packing sleeves isfivery important as the fluid rotates with the sleeve and therefore eliminates any throttling effect. and undue friction and heatingof-the fluid. Further, full advanftage is thus taken of the outward thrust of the centrifugal forces. The arrangement of cylinder will be precipitated into the oil v chamberrand be carriedto the channels in the packing sleeves "and retained there by the centrifugal forces. The blow out pas sage maybe opened at any time and the luricant' and all foreign "matter will be forcdd loutthus thoroughly cleansing the-machine.

ar- "range the outlet port 56'below the point of In the modification shown in Fig. 8, I

intersection of the arc ofthe cylinder and the piston core so thatjthe outlet is sealed theco're-andIprovide-a port in the core 1n the form .ofa recess 57 Which is of shorter length than the distancebetween the points 58 and 59., 'lhe gas orfiuid being compressed is thu's"confined-tillthe port 57 opens the exhaust andiis again sealed as the port 57 passes the point 58. '1. v

Another] very .i'mportan't feature in the the packing shoes rotating in the cylinder.

of support for the shoe and each ring is balanced so that in rotation nocentrifugal forces are set up. Further, the body of the metal of the rings'and their peripheral weight gyrate,-'causing a center of-percussionto beset up which has a tendency to overcome the otherwise resultant vibrations of the, piston while traveling at variable velocities due to the change in position of the said piston vanesin, relation to the axis of the cylinder and any slight percussion due to the shifting of; the center of gravity entirely absorbed within the rings and the transference of vibration to the other parts of the machine is practically eliminated.

operate with the minimum of friction, will be perfectly sealed at all points eliminating; leakage, will be perfectly balanced and will operate with the maximum efficiency and may be used equally well as a compressor,

vacuum pump or power unit.

What I- cla1m as my lnvention is':

1. In a rotary compressor, a cylinder, a

piston core rotatably supported eccentrically within said cylinder and having radial slots extending longitudinally thereof, shoe members arc-shaped in crosssection engaging the inner Wall of said-cylinder, means for supporting said shoe members in fixed re 'lation to the axis of said cylinder, and pistonvanes pendantly hinged to said shoe members and extending into the radial slots in said piston core.

2; In',a rotary compressor, a cylinder, a piston core rotatably supported eccentrically within said cylinder, rotary members ar- "ranged concentric with said cylinder, shoe members rigidly supported from said rotary concentric members and adapted to engage in running contact with the inner wall of'said cylinder, and piston vanes pivotally connected to said shoe membersand slidably engaging the said pistoncore. I 3. In a rotary compressor, a cylinder, a piston core'rotatably supported eccentric'ally Within said cylinder and having radial slots, rotary members concentrically journaledat the ends'of said cylinder, shoe members. ar

ranged in running contact with the surface of said cylinder and rigidly connected to.

pairs of said rotary members, said shoes being'independently rotatable Within the cyl inder, and piston vanes 'pivotallyconnected to said shoes and extending into'and sliding I in the radial slots in said-piston core.

4. In a rotary compressor, a cylinder, a

piston core rotatably supported eccentrically' 'Within-said cylinder, rotary members arwith 'sa d' cyl nder,

ranged concentric spindles extending through said cylinder and each fixedly secured at the ends in independently rotatable pairs of said .rotai'y members, shoe members ofiarc shaped cross section rigid with said spindles and engagingthe inner Wall of saidcylinder in a run- .the "'centralgfportions 2w thin, the cylinder partlyjencircling saidg'spindles, said piston vanes swinging freely an said-spindles and extending into the radial -slots in said piston core.

ranged concentric with said cylinder, piston vanes slidably arranged 1n radial arrangement in said p ston core, said vanes being bored longitudinally from' end to end the A machine constructed as described will bored hole cutting through the outer edge of the central portion, spindles extending through and rotatable in the bored holes in said vanes and. secured at the ends in independently rotatable pairs of said rotary members in fixed relationto the axis of the cylinder, and arc-shaped shoe members seinto said longitudinal recess in close running contact, saidcore having radial longitudinal slots therein, shoe members engaging the inner wall of the cylinder, ro-

tatable means for supporting said shoe members in fixed relation to the axis of the cylinder, and -piston vanes pivotally connected to said shoemembers' and sliding in the radial slots in-said piston core.

7. In a rotary compressor, a cylinder, a piston core rotatably supported eccentrioally within said cylinder and having radial slots extending longitudinally thereof, a plurality of inter-nestedannular gyratory rings, balanced independently of each other rotatably supported from their outer sides concentric with said cylinder at each end thereof,',shoe

members engaging the inner wall ofz the cyl inder and each secured'at' the ends to an in-- dependently rotatable pair of said gyra tory rings and in fixed'relation to the axis of'the cylinder, and piston vanes pivotally connected to said shoes and sliding in the radial slots insaid piston core. l .fv

, -8, In a rotary compressor, a cylinder, a piston core rotatably supported eccentrically of ring members atran'ged in sets at each'end of said cy linder rot'atably supported from' their outerw alls and; ponce'ntric therewith,

within said cylinder and having radial slots extendinglongitudinally thereof, aplurality each indi idual'ringhaving' aslug projection i I formed with a journal..bearingtherein, saidning contact, ,and' piston EV'a'nes hayn' g end portions encircling thex said spindles lugs having their axes all arranged equidistant from theflcylinderaxis and'in the same transverse plane, piston. yanes having journal endsrotatably supportedinthe bearings in corresponding'pairs oflsaid rings and havingtheir central. portions slidable inthe radial slot'sin said piston core, spindles extending longitudinally, through said pis ton vanes on'the axis of theirrotary support in said rings, said s'pindl'es being'fix ed in said rings and projecting partially through the outer edge of the central portion of said vanes, and shoe members fixed. to the central portions of said spindles projecting beyond l ends of said cylinder and fixedly secured on said piston vanes and engaging the inner wall of said cylinder in running contact 9. In a rotary compressor, a cylinder, a

piston core rotatably supported eccentrically within said cylinder and having radial slots extending longitudinally thereof, a plurality of ring members arranged in sets at each end of said cylinder rotatably supported from their outer walls and concentric therewith,

each individual ring having an inwardly projectin radial lug formed with a journal bearing-t erein, said rings being inter-nested and having the lugs arranged in the same transverse plane and their axes equidistant from the axis of the cylinder, said rings being cut away adjacent to the ugs and balanced, piston vanes having journal ends rotatably supported in the bearings in corresponding pairs of said rings and having their central portions slidable in the radial slots in said piston core, spindles extending piston core journaled eccentrically withinsaidcylinder, piston vanes operatively connected with saidpiston core within said cylinder, a pair of sleeve members encircling said cylinder and having heads closing the ends thereof, said sleeve members being rotatablv connected with said piston core and arranged concentric therewith and having a plurality of recesses "formed in the inner walls, said recesses having communicating with the cylinder and forming hydraulic chambers adapted'to retain through the centrifugal action'of the'rotating' sleeves a hydraulic packing subject to the varying pressures within the cylinder and counte'rbalancing the lateral pressure against the piston core. I

11. Ina rotary' compressor, a casing formed with an eccentrically arranged cylindertherein and annular recesses-surrounding the outer endsof the cylinder portion, heads closing the'ends :of said'casing and havin 'ournal bearin s-therein concentric with said'annular recesses'and eccentric to ton core secured to said shaft and rotating,

eccentrically within said cylinder; piston vanes operatively-comfected with said piston core and operating in said cylinder, a pair or sleeve members closed at the ends and extending into the concentric annular grooves eccentrically surrounding the ends of the cylinder and formed with heads closing the said shaft, said sleeves having a plurality of radial recesses formed in the inner wall of the heads thereof and communicating with the plurality of longitudinally arranged hydraulic chambers formed in the inner peripheral faces of said sleeves, and disk members fitting within said sleeves and abutting the radial grooved faces and having a formed with an eccentrically arranged cylinder therein and annular recesses surrounding the outer ends of the cylinder portion,

heads closing the ends of'said casing and having journal bearings therein concentric with said annular grooves and eccentric to Said cylinder, a shaft ournaled in said heads and extending through said cylinder, a piston core secured to said shaft and rotating eccentrically within said cylinder,v piston vanes operatively connected with said piston core and operating in said cylinder, a pair of sleeve members closed at the endsand extending into the concentric annular grooves eccentricallysurrounding the ends of the 'cylinder and formed with headsclosing the ends of said cylinder and fixedly secured on said shaft, said sleeves having radial openings therethrough arranged in diametrie pairs, disk members secured Within said sleeves and abutting the inner walls of the heads thereof, said disks having radial openings therethrough registering with the openings in said heads and rectangular shaped recesses of greater. width than the slots formed in the-faces abutting the heads of said sleeves, and shuttle plates slidably arranged within said rectangular shaped recesses in said disks and having openings therethrough through which the reduced end portions of the piston vanes extend, the ends of the central portions of said piston vanes extending through the slots in said disks and abutting said shuttle plates, said plates retaining theslotted openings in the head ends of the sleeves closed.

' I 13.,In a rotary compressor, a casing hav; fng an eccentrlcally arranged cylinder there in, hydraulic packing sleeves arranged con-.

centric in said casing and eccentric'to said cylinder and having radial transverse slots through the head ends thereof, packing shuttles' slidably arranged and closing said slots,

a shaftsuitably journaled in the casing and extending eccentrically 'through said cylinder and rotatably' carrying said hydraulic packing sleeves, a cylindrical piston core se-' cured to and rotating with said shaft eccentrically within said cylinder and haying radial longitudinal slots therein, piston yanes formed with parallel side faces slidably arranged in the slots 'in said piston core and having the ends of the central portions abutting said packing shuttle and having reduced ends extending through said shuttles and enlarged outer ends formed with parallel side faces extending beyond the outer faces of the hads of'said hydraulic packing sleeves, webmembers projecting from theouterface of the head ends of said packing sleeves in parallel relation to the radial slots therethrbugh and forming traverse bearing guides for said piston vanes, and roller bearings arranged between said traverse piston vane guides and the enlarged'ends- .ofxsaid piston vanes.

- 14. In a rotary compressor a casing hav-- ing an eccentrically arranged cylinder there- 1n, hydr a ul1 cpack1,ng sleeves arranged concentric insaid casing and eccentric to said cylinderand having radial transverse slots I through the heads thereof, packing shuttles slidably arranged and closing said slots, a shaft suitably journaled in the casing and extending eccentrically through saidcylinder and rotatably carrying-said hydraulic packing sleeves, a cylindrical piston core secured to and rotating with said shaft eccentrically Within said cylinder and having radial longitudinal slots therein, piston vanes formed with parallel side faces slidably arranged in theslots in said piston core and having the ends of the central portions abutting said" packing shuttle and having the reduced ends extending" through said shuttles and enlarged opter portions formed with parallel side facesextending beyond the outer facesof the heads of said hydraulic packing sleeves, web members projecting froni the outer face of the head ends of, said packing sleeves in parallel relation to the radial slots therethrough and forming trav'- erse bearing guides for saidpiston vanes,

said web members having spur teeth formed in the inner faces thereofin the form of'fa rack, andsuitably caged roller bearings arf-I" ranged between said web members and the enlarged ends of said piston vanes, said rollers having centrally arranged projecting r spur teeth adapted to engage the rack teeth formed in said webs and corresponding rack teeth formed in the adjacent faces of the enlarged ends of said piston vanes.

15. In a rotary. compressor, a casing supcentrically within said cylinder, piston vanes operating ,in said core, hydraulic packing sleeves closing the ends of said cylinder a lid rigidly connected withsaid shaft and having hydraulic recesses in the inner peripheral walls and communicating passages 0pening into the cylinder, an oil tube secured inthe central portion of the casing and hava ing discharge ends adapted to communicate with the passages in said hydraulic sleeves, said oil tube havinga downward extension leading into the oil chamber formed by the hollow base and forming an oil duct conveying oil under pressureto the hydraulic pack ing sleeves in rotation.

16. In a rotary compressor, a casing supported on a hollow base and having a central portion formedwith an eccentrically arranged longitudinal cylinder therein and inlet and outlet ports leading through said i casing to said cylinder, the outlet port communicating with-the interior of the hollow base,said cylinder also having a longitudinally. arrangedfrecess formed therein and communicating with the outlet port adapted to intercept and convey any solids finding ingress to the cylinder, a shaft journaled in said casing a piston core secured to said shaft arranged eccentrically within said cylinder, piston vanes operating in said core, hydraulic packing sleeves closing the ends lofsaid cylinder, means for conveying lubrieating fluid from the hollow base to the rota'ting packing sleeves and a blow-out passage in said casing adapted to convey the lubricating fluid 'from'said hydrauliopacking sleeves.

'17. In a rotary compressor,- a cylinder.

having a longitudinal recess of arc-shaped cross section formed-in its inner wall and an outlet; port leading from said arc-shaped recess," apiston core of lesser diameter than said cylinder journaled eccentrically therein and fittinginto said longitudinal recess in a close running contact, said core having a recessed port in its-periphery adapted to register with the outlet port to allow the escapeof the compressed fluid.

18. In a rotary compressor, a cylinder, a

piston core journaled eccentrically within 1 saidcylinder, piston vanes operatively connected with said piston core within said cylind'er, a pair'of sleeve members encircling said cylinder and having heads closing the ends thereof, said sleeve members being 1'0.-

tatably connected with said piston core and arranged concentric therewith and having slots througli the heads thereof through which the ends of said piston vanes extend,

and shuttle plates secured to the projectingends of said vanes and closing theslots in said sleeves. t

19. In a rotary compressor, a casing formed with an eccentri'cally arranged cy1- inder therein and annular recesses surround mg the outer ends of the cylinder portion, heads closing the ends of said casing and --having ournaled bearings therein concentric with said annular grooves and eccentric to said cylinder, a shaft journaled in said heads and extending through said cylinder, a piston core secured to said shaft and rotating eccentricallywithin said cylinder, pistonvanes operatively connected with said piston core and operatlng 111 said cylinder, and a pair of sleeve members closed at the ends and extending into the concentric annular grooves eccentrically surrounding the ends and a plurality of inter-nested ring members rotatably supported fromtheir outer sides and. adapted to rotate independent of each other and each having an inwardly projecting radial lug adapted to support the ends of said shoe members in differential relation the oneto'the other, the inner of said ring members having a secondary ring supported by a 'pluralityof inwardly extending radial arms.

21. In a rotary compressor, a cylinder, a

piston core eccentrically mounted in said piston, a plurality of shoe members engaging the inner walls of said cylinder, piston vanes pendantly supported from said shoes and extending radially into said piston core,

and a plurality of inter-nested ring members rotatablysupported from their outer sides andadapted to rotate independent of each other and each having an inwardly projecting radial lug adapted to support the ends of saidshoe members in .difierential re lation the one to the other, the inner of said ring member-shaving a secondary ring sup portedby. a plurality of inwardly extending radial arms, said lugs having arc-shaped flange portions formed on their inner sides adapted to engage-the outer peripheral face of the secondary ring of the inner ring member. 22. In a rotary compressor, a cylinder, a piston core eccentrically mounted in said tpiston, aplurality of shoe members engaging the inner walls of said cylinder, piston vanes pendantly supported from said shoes and'extending radially into said piston core, and a plurality of inter-nested ring members rotatably supported from their outer sides other and each having an inwardly projecting radial lug adapted to support .the ends of said shoe members in differential relation the one to the other, said rings being out and adapted to rotate independent of each away on the sides adjacent to the lugsto balance their peripheral weight.

23. In a rotary compressor, abylinder, a

piston core journaled eocentrically-within said cylinder, piston vanes operatively C011. nected withsaid-plston core within said cylnder, a pair ra'fsleeve members encircling and closing the ends of said cylinder and having circular heads formed integral therewith and ofyslightlylarger diameter than.

the outer periphery of the sleeves, the inner faces of the projecting portions abutting the end faces of the'cylinder, said sleeve members being rotatably connected with said pis ton core and arranged concentric therewith. Signed atthe city or Toronto, -county of York, Province of Ontario, in the Dominion of Canada,,this 8th day of @ctober 1912.

"Witnesses v ELL. TRIMBLE,',

E. HERO wiLLiar/ srionn a 

